Mapping QTL affecting resistance to Marek's disease in an F6 advanced intercross population of commercial layer chickens

Table 1 Pool composition according to family (F) and MHC type (BT)

F	BT	Total No.	Resistant		Susceptible
			No.	Prop	No.	Mean	Range
1	2/15	144	30	0.51	29	59.1	30–73
	2/2	51	27	0.44	12	59.8	30–73
	2/2¹	-	-	-	12	94.0	73–113
	15/15	96	30	0.71	19	70.8	30–115
2	2/15	110	30	0.62	22	65.0	46–84
	2/2	70	30	0.49	14	68.9	17–92
	15/15	51	29	0.57	10	66.2	43–79
	15/15¹	-	-	-	10	103.6	80–123
3	2/15	136	30	0.26	20	53.6	30–64
	2/2	83	26	0.31	16	52.6	39–62
	15/15	52	17	0.33	10	63.2	48–73
	15/15¹	-	-	-	10	79.7	74–90
4	2/15	62	25	0.40	12	50.9	33–61
	2/15¹	-	-	-	12	72.9	62–87
	2/2	273	53	0.41	53	57.5	30–75
5	2/15	224	45	0.25	45	52.6	30–64
	2/2	44	8	0.18	9	57.9	44–72
	15/15	231	46	0.51	46	65.0	41–78

¹ The number of individuals in the susceptible pools was low (10 to 12 birds), hence an additional susceptible pool was created, which contained the next most susceptible 20% of birds.
Total No., total number of individuals in the F × BT combination; Resistant: number of individuals included in the resistant pool (No.), and proportion of individuals that survived to the end of test (Prop); Susceptible: number included in the susceptible pool (No.), with their mean and range of survival times in days.

ISSN: 1471-2164